Summary
Thrawn's alliance with the Nightsisters suggests he has brought a powerful army of undead Nightsisters to aid in his conquest of the galaxy.
The Nightsisters wield formidable dark magic and possess unique powers that even the Sith dreaded, rendering them a menacing peril to the New Republic.
Given the near-extinction of the Jedi, the New Republic finds itself defenseless against Thrawn's army of undead, leaving Ezra Bridger as the sole Jedi capable of opposing the multitude of Nightsisters.
The Ahsoka finale foreshadowed Thrawn as the successor to the Sith, positioning him as the formidable new villain in the Star Wars universe between the original and sequel trilogies. His emergence threatens the fragile peace established by the New Republic. Thrawn's cunning tactics had previously triumphed over the Rebellion, and he now aims to revive the Empire meticulously and without haste. Interestingly, he chooses to establish his Empire on Dathomir instead of opting for renowned city planets like Coruscant or Hosnian Prime. Furthermore, the consequences of what Thrawn brought from Peridea may be more terrifying than Thrawn himself.
During his time on Peridea, Thrawn forms an alliance with the enigmatic Great Mothers of the Nightsisters, who possess a wealth of spells and powers. Although their loyalty to Thrawn remains unclear, they collaborate to escape from Peridea and find their way back to Dathomir. Despite making it clear that escaping his exile is his top priority, Thrawn permits the Great Mothers to load numerous coffin-like capsules onto his ship before departing. In essence, Thrawn prioritizes the retrieval of these capsules, acquired from the Nightsister's catacombs, over an immediate departure from Peridea. The contents within these capsules have the potential to significantly shape the future of the Star Wars universe.
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Evidence Suggests Thrawn Has Brought A Nightsister Army With Him To Dathomir
While the specific contents of the Nightsister capsules remain undisclosed, a prevailing theory posits that they contain the remains of deceased Nightsisters. Considering the Nightsisters' ability to resurrect the dead, it is plausible that the capsules aboard Thrawn's ship harbor a dormant army of Nightsisters eagerly awaiting revival. Thrawn is willing to risk the interception of Ahsoka, Sabine, and Ezra in his attempted escape from Peridea because he seeks the immense power and advantage promised by these capsules. Put simply, although he could recruit other ex-Imperials, such as the Imperials Shadow Council, to aid him in his battle against the New Republic, an instant army of reanimated Nightsisters offers a considerably more expedient route to triumph.
While the Ahsoka series did not provide explicit details on the process, it is evident that Thrawn played a role in rousing the Great Mothers from their dormant state. Likewise, the Great Mothers possess the extraordinary ability to awaken their deceased sisters, who may possess exceptional and formidable abilities. It is worth noting that the resurgence of reanimated Nightsisters is not unprecedented in the Star Wars universe. Prior to the eradication of the Nightsisters of Dathomir, an ancient Nightsister by the name of old Daka summoned an army of undead beings to oppose the Separatists during the Clone Wars.
Sith Were More Powerful Than Nightsisters - But Fewer In Number
Throughout history, the Republic has faced numerous threats from the Sith, who sought power and dominance. Surprisingly, even the Sith themselves were wary of the enigmatic Force abilities and mystical powers possessed by the Nightsisters. The Sith, adhering to Darth Bane's Rule of Two, were always outnumbered by the Nightsisters, as their numbers continued to grow without ceasing. Ultimately, in an attempt to eliminate the Nightsisters on Dathomir, Count Dooku dispatched General Grievous, but it's conceivable that Thrawn could have easily resurrected them.
If Thrawn's capsules are storing Nightsisters, the New Republic is facing a grave problem. The recurrence of the same individuals within the New Republic indicates a staffing deficiency. Despite enduring over two decades of oppression under the Empire, no one wishes to contemplate a potential resurgence of Thrawn or the Imperials. Nevertheless, Thrawn's rapidly assembled Nightsister army has the potential to disrupt the tranquility of the New Republic; unfortunately, the New Republic lacks the necessary personnel to effectively counter this undead force.
With So Few Jedi, The Republic Is Vulnerable To The Nightsisters
With most of the Jedi now gone, the New Republic is left extremely vulnerable to Thrawn's newly formed army of the undead. Ezra Bridger, in contrast to Luke Skywalker, has emerged as a contrasting force. While Luke focuses on rebuilding the Jedi Order on Ossus, Ezra will likely be at the forefront, fighting alongside the New Republic against Thrawn. However, Ezra Bridger may be the sole remaining true Jedi within the New Republic, which means he will face overwhelming odds against the formidable force of hundreds of Nightsisters under Thrawn's command.
If the New Republic had a strong contingent of Jedi like the Galactic Republic did, they would have easily defended against the Nightsisters. However, without the Jedi, the New Republic is vulnerable to the Nightisisters' dark magic. The reason behind the Great Mothers' delay in resurrecting the capsules in the original Star Wars galaxy remains a mystery. It is possible that it is somehow connected to the location of Dathomir. Nevertheless, Ahsoka has presented Thrawn's army as a formidable challenge for future Star Wars heroes to confront.